What is the fastest way to level as a Death Knight?

What is the fastest way to level as a Death Knight? I'm 85 right now, and did it mostly as Frost. I'm just wondering if by chance one of the other specs is better. I just want the fastest way not the easiest.

I always found blood to be the fastest, except in condensed areas such as caves where you pull a ton of weaker than average mobs together that die in a few hits. In those cases I switched to frost, for both howling blast and the death strike glyph heal spam.

My blood DK had same or higher DPS during leveling than my multidotting shadow priest. Plus it cannot die. Not like SPs die a lot...
So no idea how much faster/slower it is than frost, but I didn't find it slow.

edit: yes I have used dps gear but it's not easy to come by such gear as blood in MoP zones for obvious reason - quests hand out rewards for your current spec and I didn't feel like speccing dps at each turn in.

Frost. Frost is still the fastest way. Why? Mobs aren't grouped up. If you want to grab piles of mobs, you spend more time doing that and slowly killing them with death strike and blood boil than I would killing them in 1's and 2's as frost. Just get Glyph of Dark Succor for free DS's and 20% heals on every mob you kill.

Blood in Frost Presence with Death Siphon and Glyph of Dark Succor. Death strikes will give you 4 death runes which can be used on Death Siphon, Death Siphon heals you for near 50% of your health and does big damage until level 80 or so. Add in free Death Strikes from the glyph and you'll roll through everything.

I tried frost for a while, but after being ganked a few times and realizing that you just can't pull more than 2 mobs with frost I stayed blood since it's way more comfortable.
+ AoE leveling
+ pretty much unkillable
- slightly lower single target damage

---------- Post added 2012-11-30 at 03:51 PM ----------

Originally Posted by cmoneyr

Blood in Frost Presence with Death Siphon and Glyph of Dark Succor. Death strikes will give you 4 death runes which can be used on Death Siphon, Death Siphon heals you for near 50% of your health and does big damage until level 80 or so. Add in free Death Strikes from the glyph and you'll roll through everything.

Considering the OP is lvl 85 using that strategy has lots and lots of flaws :
missing the damage reduction and mastery shield from blood presence
lower rune regen rate
Death Siphon is weaker in damage and healing than Death Strike unless you have massive AP/damage/healing buffs

I always found blood to be the fastest, except in condensed areas such as caves where you pull a ton of weaker than average mobs together that die in a few hits. In those cases I switched to frost, for both howling blast and the death strike glyph heal spam.

by the time he switch's spec all the time, they would of died,

I did my blood dk, well still doing hes 87 now, in 1/4 of the time I did my Fire mage or SP, at that point, pick up the quests, Mass pull mobs 6-9 at a time, outbreak pestiliance, Death Strike to keep a shield up, once those runes are depleted, Rune strike, rinse repeat packs die in about 10 -12 seconds

Considering the OP is lvl 85 using that strategy has lots and lots of flaws :
missing the damage reduction and mastery shield from blood presence
lower rune regen rate
Death Siphon is weaker in damage and healing than Death Strike unless you have massive AP/damage/healing buffs

I probably should have read the part where he said he was 85. Yeah 85 and on I went Frost and didn't look back. From 60 to 80 it was incredible though, I've never felt more OP.

Frost. Frost is still the fastest way. Why? Mobs aren't grouped up. If you want to grab piles of mobs, you spend more time doing that and slowly killing them with death strike and blood boil than I would killing them in 1's and 2's as frost. Just get Glyph of Dark Succor for free DS's and 20% heals on every mob you kill.

Yep this is exactly correct. If mobs were all grouped up, blood would be great. But in most questing spots they aren't. So go frost, ideally DW frost (as you'll be frost striking more than obliterating), with the glyph of +5 yds death grip, death grip cd refresh on kill, and dark succor, and go to town. Also I suggest parking an alt at this spawn and putting windsong on it. It helps a lot. I leveled my DK first, but it's been amazing on my ret and warrior.